Bob- Where are you? USA or elsewhere. As you're just starting out I might suggest that you'll be running through your files at a faster rate in the beginning then after a few years of skill building. Not sure that file quality will make a big difference yet. I suspect a wider range of file shapes and sizes will be a greater value starting up then real nice ones but of only a few shapes/sizes.
Here in the USA we have industrial suppliers like
https://www.mcmaster.com/hand-files and others to source files from. Although I have done the local hardware store many times before. Andy